Django Choices显示值

Question

Model.py:

class RiskIssue(models.Model):
    RISK_ISSUE_SEVERITY = (
        ('L', 'Low'),
        ('M', 'Medium'),
        ('H', 'High'),
    )
    projectRiskIssueSeverity = models.CharField("Risk/Issue Severity",
                      max_length=1, choices=RISK_ISSUE_SEVERITY, default='L')

View.py code:

cell = table.rows[2].cells[0]
formatted_status = [astatus.get_projectRiskIssueSeverity_display() for
              astatus in activitylist.values_list('activityStatus', flat=True)]
cell.paragraphs[0].text = ', '.join(formatted_status)

I am getting the error code: 'unicode' object has no attribute 'get_projectRiskIssueSeverity_display'

What am I doing wrong? I have tried everything except the correct answer. Very small TypeError problem here I assume activitylist is a unicode object and does not need activitylist.objects before it.

The issue here is: the astatus.get_projectRiskIssueSeverity_display() , This is not working as expected according to https://docs.djangoproject.com/en/dev/ref/models/instances/#django.db.models.Model.get_FOO_display

Answer 1

Note that get_FOO_display() is an instance method on the model. .values_list() doesn't return any model instances, so the value won't have any get_FOO_display() methods.

Answer 2

You can use get_FOO_display() on model instances only. Use intermediate dictionary to get the display name from the pure status value:

severity_d = dict(RiskIssue.RISK_ISSUE_SEVERITY)
formatted_status = [severity_d[astatus] for astatus in
                    activitylist.values_list('activityStatus', flat=True)]